From ecd30076fcfe396510a463757a910a44e319321b Mon Sep 17 00:00:00 2001
From: chrislu <chris.lu@gmail.com>
Date: Thu, 13 Nov 2025 23:54:52 -0800
Subject: [PATCH] set header

---
 weed/s3api/s3api_object_handlers.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index c9842cb59..312e1a5a9 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -637,11 +637,12 @@ func (s3a *S3ApiServer) setResponseHeaders(w http.ResponseWriter, entry *filer_p
 	}
 
 	// Set custom headers from entry.Extended (user metadata)
+	// Use direct map assignment to preserve original header casing (matches proxy behavior)
 	if entry.Extended != nil {
 		for k, v := range entry.Extended {
 			// Skip internal SeaweedFS headers
 			if !strings.HasPrefix(k, "xattr-") && !s3_constants.IsSeaweedFSInternalHeader(k) {
-				w.Header().Set(k, string(v))
+				w.Header()[k] = []string{string(v)}
 			}
 		}
 	}